Sewing-machine.



0. E. BROWN.

SEWING MACHINE.

APPLICATION FILED SEPT. 21. 1911.

Patented May 2,1916.

2 SHEETS-SHEET I.

WI T/VESSES:

IN V N 70/? my a ATTO THE COLUMBIA PLANOGRAPH 50-. WASHINGTON. D. C

0. E. BROWN.

sewma MACHINE.

APPLICATION FILED SEPT- 27|19H.

Lll lflfi, Patented May 2,1916.

2 SHEETSSHEET 2.

WITNESSES;

THE COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

TlTT i j.

FFT@

OTIS E. BROWN, OF BROGKTON, MASSACHUSETTS, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Application filed September 27, 1911.

To all whom it may concern:

Be it known that I, Orrs E. BROWN, a citizen. of the United States, residing at Brockton, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates more particularly to an improvement in that class of waxt-hread sewing machines comprising an open-eyed or hooked needle and a looptaker cooperating therewith beneath the work-support in conjunction with an upperthread carrier and a reciprocating awl. disposed above the work-support, although it is adapted to other classes of stitch-forming mechanism.

The invention has for its primary object to provide a needle mechanism actuated by a simple crank or eccentric and so timed as to cooperate effectively with the awl and to remain. retracted from the work during the setting of each stitch by the take-up.

It has for its further object to provide a crank-driven awl cooperating effectively with the needle so driven. I

According to the present invention, in its preferred form, the needle has a crank-andpitman connection with an actuating rockshaft disposed below the work-support and having its crank so set thereon that the pitman connection is caused to move into and out of parallelism with said crank while the needle is in substantially lower retracted position. The operative connection between an actuating eccentric upon the main-shaft and said rock-shaft includes crank-and-pitman mechanism of which the pitman has a pivotal connection with a strap embracing said eccentric which moves toward and from a point near the axis of motion of the eccentric. By this means, the needle is given a long period of rest in retracted position which is produced by its described connection with the actuating rock-shaft and the connection above mentioned of said rockshaft with the main-shaft.

The main-shaft carries an awl-aetuating crank embraced by one end of a pitman whose opposite end. has a pivotal connection with the awl-bar which approaches and recedes from a point near the axis of the mainshaft, whereby a dwell is givento the Specification of Letters Patent.

Patented May 2, 1916.

Serial No. 651,556.

awl in its upper retracted position to enable the needle to rise for seizure of its thread, descend to present a loop for seizure and casting around the lower thread by the shuttle and setting of the stitch by the takeup preparatory to the descent of the awl through the work to produce a new puncture.

The invention will be understood by reference to the accompanying drawings, in which- Figure 1 is a side elevation of a wax thread sewing machine embodying the present improvements, and showing the frame of the machine in section. Fig. 2 is a front end elevation representing the stitch-forming and awl mechanisms in the positions which they assume when the point of the needle is just emerging from the upper face of the work, Fig. 3 a front elevation of the entire machine with the said parts in the positions assumed when the needle is at the upper end of its stroke, and Fig. 4 an elevation similar to Fig. 2, but showing in full lines the needle in partial retracted and loop-presenting position, and in dotted lines certain parts of the needle-actuating mech anism when the needle is on the dwell in extreme retracted position. Fig. 5 is a detail view showing a portion of the needle rock-shaft actuating mechanism in the position corresponding with that represented in Fig. 3. Fig. 6 is a perspective view showing a section of material with the needle passing through it and in the act of seizing a thread-loop from the upper-thread presenting means.

The frame of the machine is shown con structed with the hollow base 1, tubular standard 2 and hollow overhanging arm 3 formed'with the head 4 and in which is journaled the main-shaft 5 carrying the balance-wheel 6 and belt-pulley 7. The main-shaft has fixed thereon by means of the set-screw 8 the hub 9 of the needleactuating eccentric 10 embraced by the strap 11 provided upon its lower side with the lug 12 connected by means of the pivotal pin 13 with the outer end portion of a curved vibratory arm 141 having a hub 15 mounted upon fixed center-screws 16 sustained by the bearing lug 17 upon the rear of the overhanging arm 3. The arm 14 is so proportioned and fulcrumed, and the eccentrip 10 is of such size that in the rotation of the main-shaft the pivotal pin 13 moves into and out of a position closely adjacent to the-main-shaft and substantially within the range of movement of the eccentric so as to produce a slow reversal of movement of the arm 14: when in its upper position and a more rapid reversal when in lower position.

The eccentric strap 11 and its lug 12 together constitute practically an eccentricrod having a effective length equivalent to the distance from the center of the eccentric to the pivotal pin 13 by which it is connected with the arm 14, which in the present instance is less than'double the throw of the eccentric. When the center of the eccentric is above that of the main-shaft 5, as represented in Fig. 4c, the upper end of the eccentric-rod swings upon the pivotal pin 13 in an are which is tangent to and, on opposite sides of the dead center position, approximately concentric with the circular path of movement of the center of the eccentric around the main-shaft, so that in the movement of the eccentric through such are theposition of the pivotal pin 13 is not appreciably moved, from which a period of dwell results. lVhen, however, the eccentric is in the lower position represented in Fig.

3', the upper end of said eccentric strap swings upon the pin 13 in an are which is convex relative to the path of circular move ment of the center of the eccentric, whereby the arc of approximate coincidence between said paths of movement is greatly reduced. and the period of reversal of lateral move ment of the pin 13 is correspondingly shortened, with a quick reversal of movement of the arm 14.

To a lateral extension 14* of the arm 1'1 is connected by means of the pivotal pin 18 vthe stud-pin 28 carried by the crank-arm 29 of the needle-actuating rock-shaft 30 mounted within the basel parallel'with the mainshaft 5.

The rock-shaft 30 carries at its forward end the crank-arm 31 provided with the rock-shaft 30 that when the arm 14 is in its extreme upper position the crank-arm 31 is 1n 1ts extreme lower posltion; as represented in dotted lines in Fig. 4,.wherein the pitman .;33.;conne cting the pins 32 and 4 assumes a position substantially parallel with such crank-arm with which it forms a toggle device. so that the approach to and recession from such dotted-line position has no appreciable effect in reciprocating the needle whose period of dwell in lower retracted position is augmented by the slow reversal of movement of the vibrating arm 14 in its upper position. In other words, the dwell produced by the described connections between the needle-bar and the rock-shaft 30 even when the latter is in motion is augmented by the previously described dwell of the rock-shaft actuating means which produces a practical interruption in the movement of the rock-shaft in its own dwell-producing period.

The needle-bar 37 is mounted for reciprocation in the bearing bosses 39 of the jogging rectangular frame 10 having at one edge the lug 41 carrying the stud-pin t2 and at the other edge the split lug 4.3 in which is socured by means of the clamp-screw 41 the stud 45 moving in. the segmental guide-slot 4.6 and carrying a slide-block 45 fitted within a guideway in the bearing member 4-7 upon the rigid arm 48 sustained by the base 1. One of the lateral members of the needleframe 10 affords a guideway for the forked lug 35 of the collar 36 by means of which the needle-bar is prevented from turning. The stud-pin 4:2 .is embraced by the upper end of an upwardly extending cranlvarm 4-9 upon the tubular feed rock-shaft 50 journaled within and longitudinally of the base 1 and having a. second upright arm 51 whose upper end embraces a. screw-stud 52 of the vibratory feed-lever 53 whose forked opposite end 5 1 embraces the feed-actuating cam 55 upon the upright shaft 56 driven by means of a bevel gear connection 57 with the mainshaft 5, said feed-lever 53 having intermediate its ends an adjustable fulcrum carried by the stitch-regulating lever 58 all substantially as shown and described in my Patent No. 150013309, of August 29, 1911.

By the means just described, the needleframe 40 receiies its operative work-advancing movement while the needle is in its upper position, as represented in Fig. 3, and its retrograde movement when the needle is on the dwell and as the crank-arm 31 isrcceding from its dotted line position as rep resented in Fig. 1. As will be observed, in the extreme lower position of the crank-arm 31, the needle-bar pitman 33 is inclined relative to the needle-bar in the opposite direction from that shown in full lines in said figure, and the retrograde lateral movement of the needle-frame causes the movement of the stud-screw 3.1 to the right simultaneously with the lateral and downward movement of the stud-pin 32 to the left, thereby preventing any endwise movement of the needlebar during the initial retrograde movement of the crank-arm 31 from such extreme dotted line position.

Fixed upon the forward end of the mainshaft is the crank-arm 59 carrying the stud-screw (30 which is embraced by the apertured upper end of the pitman 61 whose lower end embraces the stud-screw 62 carried by the swinging arm 63 which is journaled upon the fulcrum-pin 64 sustained by the head l of the bracket-arm. The parts are so constructed and arranged that in the upper position of the crank-pin ($0 represented in Fig. 4., the stud-screw 62 occupies a position. close to the axis of the main-shaft and substantially within the range of movement of the crank-pin, so as to produce a slow reversal. of the vibratory movement of the arm 63 at the upper end of its traverse and a more rapid reversal of such movement at the opposite end of its traverse.

Like the arm 1-1, the arm 63 has a lateral extension 63 carrying a pivotal pin 65 which embraced by one end of a pitman 66 whose opposite end embraces the stud-screw 67 carried by a yoke-member (38 having the bosses 69 secured upon the awl-bar 70 journaled in bearing bosses 71 of the bracket-arm head 4: and carrying the awl 72. The yokemember 68 is provided with a lateral forked lug 68 embracing a guiderod 73 sustained by the bracket-arm head 4:. The slow reversal of movement of the swinging arm 63 at the upper end of its traverse produces a dwell of the awl-bar in its highest position. as represented in Fig. t, to give suiiicient time while the awl is retracted from the work for the needle to rise to seize its thread and descend to present its loop for seizure by the shuttle, the casting of the needlethread loop about the lower thread and the drawing up and setting of the stitch by the take-up.

As herein shown. the loop-taker is of the rotary shuttle type and is formed with a body 74: and beak 75. and contains a nonrotary thread-case 76 with upwardly directed loweuthread delivery tube 77. The shuttle is actuated by means of the driver 7 8 to perform two rotations for each reciprocation of the needle by means of mechanism including the gear-wheel. 79 upon the rotary shaft 80 connected by the intermeshiug'bevel-gears 81 and 82 with the upright rotary shaft 56.

The upper thread. is presented for seizure by the needle by means of a reciprocating thread-arm 83 formed with the guide-eye S4- and adapted to move across the path of the needle. in conjunction with a vibratory thread measuring arm 95 formed with a book 86 which. serves to engage the thread between the thread-eye S4 and the needle aperture of the throat-plate 87 and to draw the same laterally over the lateral. finger Sr of the rigid thread-supporting arm 89 sue tained by the bracket-arm head 4.. As the strand of thread extending between the eye 8th and the finger 88 enters the needle-eye and the needle descends with it, the measuring arm 595 performs its lateral retrograde -movement to disengage the thread from its hoolr 86 to allow slack for the loop subsequently presented-for seizure and distention by the shuttle.

Fixed upon the main-shaft 5 is the takeup cam 90 whose cam-groove 91 is entered by the stud of the upright arm 93 of a bellcranlr-lever fulcrumed upon the bracketarm 3 and having a lateral arm 91- connected by means of a pitman 95 with the take-up lever 96 fulcrumed at 97 and carrying a series of thread-wheels 98 over which the thread passes from the source of supply to the fixed guide 99 sustained by the bracketarm head above the range of movement of the thread-eye 84, all as shown and described more fully in my application filed simultaneously herewith. The take-up cam so formed that the take-up lever receives its operative movement for drawing up the needle-thread and setting the stitch while the awl is performing the initial portion of its descent and before the needle has commenced its ascent after its long period of dwell.

In the operation of the machine, the material m having been. introduced beneath the presser-foot 100 upon the throat-plate 8'7 with the parts in the dotted line position represented in Fig. 4C. in which the needle and awl are in their extreme retracted positions. the mechanism is set in motion and the awl descends through the material while the needle is on the dwell and in its upward movement is followed by the now rising needle which follows it closely as represented in 2. The awl rises more rapidly than. the needle to extreme upper position. as represented in Figs. 1 and 3, wherein the upper-thread handing members and 85 perform their operative movements to lay the needle-thread a within the eye of the needle. as represented more particularly in Fig. 6. While the awl remains in its upper position, the needle descends and draws with it the thread-loop a which is seized by the beak 75 of the shuttle before the needle reaches its lowest position, as represented in Fig. 4. During the remain ing portion of the descent and dwell of the needle, the upper-thread loop is cast about the thread-case 76 and encompasses the lower thread 7). and is drawn up and set by the take-up. The lateral feeding movement of the needleframe 40 to advance the work for the succeeding stitch formation is produced as the needle completes its upward thrust,

as represented in Figs. 1 and 3.

While the needleand awl-actuating mechanisms are preferably constructed as herein shown and described, it is evident that they may be materially modified within the scope of the present improvement, the

provement, cranks and eccentrics are considered full equivalents each of the other, and that the designation of the one in the appended claims isunderstood to include the other. e

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, the combination with the main-shaft, an actuatlng eccenti 1c hxed thereon, and a reciprocating needlebar carrying a needle, of a vibratory lever mounted upon a fixed fulcrum, a strap embracing said eccentric and having a pivotal connection with said vibrating lever movable'into and out of a position adjacent the axis of motion of said eccentric, a pluralarmed rocker, a pitman connection between one arm of said rocker and the vibratory lever, a rock-shaft provided with two crankarms, a connection between the other arm of said rocker and an arm of said rockshaft, and a pitman connection between the second arm of said rock-shaft and the needle-bar, the second-named crank-arm being so set upon said rock-shaft that adjacent one extreme position it carries the link connection with the needle-bar into and out of substantialparallelism with itself.

9.. In a sewing machine, the combination with the main-shaft provided with a crank and an eccentric, a needle-bar carrying a needle, and an awl-bar carrying an awl, of a dwell-producing operative connection between said crank and the awl-bar for imparting to the awl-bar reciprocatory movements wherein the period of reversal at the end of its upstroke exceeds that at the opposite end, and a dwell-producing operative connection between said eccentric and the needle-bar for imparting to the latter reciprocating movements whose period of reversal at one end of its traverse is greater than that at the opposite end and exceeds that of the longest dwell of the awl-bar, the respective dwells of the needle-bar and awlbar occurring while each is in retracted position.

8. In a sewing machine, the combination with the main-shaft provided with a crank and an eccentric, a needle-bar carrying a needle, and an awl-bar carrying an awl, of a swinging lever mounted upon a fixed fulcrum adjacent said crank, it pitman'connection betweensaid lever and the awl-bar, a pitman connection between said crank and the vibrating lever and having a pivotal connection with the latter movable into and out of a position near the axisof said shaft, a vibratory lever mounted upon a fixed fulcrum adjacent said eccentric, a dwell-producing operative connection between said vibratory lever and the needle-bar, 'and a strap embracing said'eccentric and having a pivotal connection with said vibratory lever movable into and out of a position near the axis of motion of said eccentric.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

OTIS E. BROWN. Witnesses HENRY J. MILLER,

I-Innnv A. KORNEMANN, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

i Washington, I). C. 

